package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var t int
	fmt.Fscan(in, &t)
	for i := 0; i < t; i++ {
		var x, n int64
		fmt.Fscan(in, &x, &n)
		if n%2 == 1 {
			fmt.Fprintln(out, x)
		} else {
			fmt.Fprintln(out, 0)
		}
	}
}